diff --git a/src/funktion.c b/src/funktion.c
index 8c3696d..e47421f 100644
--- a/src/funktion.c
+++ b/src/funktion.c
@@ -264,3 +264,18 @@ int binomial_coefficient(int n, int k) {
     }
     return result;
 }
+int ByOne(int n) {
+    int orig, count = 0;
+    orig = n;
+    while (n > 0) {
+        n = n >> 1 << 1;
+        if (orig - n == 1)
+            count++;
+        orig = n >> 1;
+        n = orig;
+    }
+    orig = count;
+    n = count;
+    printf("Das Ergebnis lautet: %d", n);
+    return count;
+}
\ No newline at end of file
diff --git a/src/funktion.h b/src/funktion.h
index 1125b81..44890b8 100644
--- a/src/funktion.h
+++ b/src/funktion.h
@@ -43,5 +43,6 @@ double Vangle(float x1, float x2, float x3, float z1, float z2, float z3);
 float vPunkt(float x1, float x2, float x3, float z1, float z2, float z3, float p1, float p2, float p3);
 double probability_from_tree(double successful_outcomes, double total_outcomes, double branches);
 int binomial_coefficient(int n, int k);
+int ByOne(int n);
 
 #endif
diff --git a/src/main.c b/src/main.c
index 0634d66..29d6c22 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,6 +7,7 @@
 int main()
 {   
     double a,b,c,d,h,x1,s1,x2,x3,z1,z2,z3,p1,p2,p3,m,x,y,z;
+    int n;
     a = getValue('a');
     b = getValue('b');
     h = getValue('h');
@@ -204,4 +205,7 @@ int main()
     a = getValue('a');
     b = getValue('b')
     binomial_coefficient(a, b);
+
+    n = getValue('X');
+    ByOne(n);
 }